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btrfs: get ->kill_sb() of its own

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... and move free_fs_info() to that, out of ->put_super().  Do NOT
set ->s_fs_info to NULL in the latter; we need it for sget() to
be able to see and wait for fs in the middle of umount if we get a
mount/umount race.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-17 01:22:46 -05:00
parent 98c7089c76
commit aea52e19dd
1 changed files with 18 additions and 9 deletions
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27
fs/btrfs/super.c
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@ -147,14 +147,13 @@ void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
static void btrfs_put_super(struct super_block *sb)
{
struct btrfs_root *root = btrfs_sb(sb);
int ret;
ret = close_ctree(root);
free_fs_info(root->fs_info);
sb->s_fs_info = NULL;
(void)ret; /* FIXME: need to fix VFS to return error? */
(void)close_ctree(btrfs_sb(sb));
/* FIXME: need to fix VFS to return error? */
/* AV: return it _where_? ->put_super() can be triggered by any number
* of async events, up to and including delivery of SIGKILL to the
* last process that kept it busy. Or segfault in the aforementioned
* process... Whom would you report that to?
*/
}
enum {
@ -1223,11 +1222,21 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
return 0;
}
static void btrfs_kill_super(struct super_block *sb)
{
struct btrfs_fs_info *fs_info = NULL;
if (sb->s_root)
fs_info = btrfs_sb(sb)->fs_info;
kill_anon_super(sb);
if (fs_info)
free_fs_info(fs_info);
}
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
.mount = btrfs_mount,
.kill_sb = kill_anon_super,
.kill_sb = btrfs_kill_super,
.fs_flags = FS_REQUIRES_DEV,
};